Study of the effect of annealing process on the performance of P3HT/PCBM photovoltaic devices using scanning-probe microscopy

Yu Ching Huang, Yu Chia Liao, Shao Sian Li, Ming Chung Wu, Chun Wei Chen, Wei Fang Su

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

We have studied the effect of annealing process on the performance of photovoltaic devices based on the bulk heterojunction of poly(3-hexylthiophene) and [6,6]-phenyl-C61 butyric acid methyl ester (P3HT/PCBM). By means of atomic force microscopy (AFM) and scanning of near-field microscopy (SNOM), we can observe the morphology evolution of the annealed P3HT/PCBM composite films. We also studied the changes of optical properties by absorption spectroscopy and the changes of composition distribution of annealed composite films. The results indicate the P3HT in the composite film gradually becomes an ordered structure with annealing. The ordered P3HT facilitates the charge transport. However, the film exhibits a large-scale (1 μm) PCBM aggregation after annealing for an extended period of time. The disrupted bi-continous phase retards the charge transport. Thus, the device efficiency reaches the highest (2.308%) after annealing at 140 °C for 30 min but decreases to 0.810% after 60 min annealing.

Original languageEnglish
Pages (from-to)888-892
Number of pages5
JournalSolar Energy Materials and Solar Cells
Volume93
Issue number6-7
DOIs
Publication statusPublished - Jun 1 2009
Externally publishedYes

Keywords

  • Anneal process
  • Atomic force microscopy
  • Photovoltaic
  • Scanning near-field microscopy

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films

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